| Abbreviation | Definition |
|---|---|
| SYX | Sanya, Mainland China |
| SYY | Stornoway, Scotland, UK |
| SYZ | Shiraz, Iran |
| SZA | Soyo, Angola |
| SZB | Sultan Abdul Aziz Shah Airport, Subang, Kuala Lumpur, Malaysia |
| SZC | Santa Cruz, Costa Rica |
| SZD | Sheffield City Airport, Sheffield, England, UK |
| SZG | Salzburg |
| SZG | W. A. Mozart Airport, Salzburg, Austria |
| SZH | Senipah, Indonesia |
| SZK | Skukuza Airport, Skukuza, South Africa |
| SZL | Knob Noster, Missouri |
| SZN | Saugus Logan Airport, Saugus, Massachusetts USA |
| SZP | Santa Paula Airport, Santa Paula, California USA |
| SZQ | Saenz Pena, Buenos Aires, Argentina |
| SZR | 23 Helicopter Air Base, Stara Zagora-Kolyu Ganchevo Airport, Stara Zagora, Bulgaria |
| SZS | Stewart Island, New Zealand |
| SZT | San Cristobal de Las Casas, Mexico |
| SZT | Sandpoint Airport, Sandpoint, Idaho, USA |
| SZU | Segou, Mali |